/**
 * Copyright 2013-2014 Guoqiang Chen, Shanghai, China. All rights reserved.
 *
 * Email: subchen@gmail.com
 * URL: http://subchen.github.io/
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package jetbrick.web.mvc;

import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

public class WebContextListener implements ServletContextListener, ServletRequestListener {
    private static ServletContext sc = null;
    private static final ThreadLocal<HttpServletRequest> requestContext = new InheritableThreadLocal<HttpServletRequest>();

    public static ServletContext getServletContext() {
        return sc;
    }

    public static HttpServletRequest getRequest() {
        return requestContext.get();
    }

    public static HttpSession getSession() {
        return getRequest().getSession();
    }

    @Override
    public void contextInitialized(ServletContextEvent sce) {
        WebContextListener.sc = sce.getServletContext();
    }

    @Override
    public void contextDestroyed(ServletContextEvent sce) {
        WebContextListener.sc = null;
    }

    @Override
    public void requestInitialized(ServletRequestEvent sre) {
        requestContext.set((HttpServletRequest) sre.getServletRequest());
    }

    @Override
    public void requestDestroyed(ServletRequestEvent sre) {
        requestContext.remove();
    }
}
